[Johnny Mullet]

Weight reduction does help, but only gets you so far. I maybe gained on estimate about 1 MPG by losing the rear seat, jack, spare, tools, etc, but removing my mirror and antenna gave me about 3 MPG increase, so I would suggest aero modding and some slight weight reduction.

Removing stuff like interior panels and carpet will only make the inside of the car much louder and pick up road noise. I removed all my interior panels in the back, but they literally weighed less than 5 pounds for all, so I put it all back in.